Process of bleaching



(No'ModeL) J. A MYRI-CK; PROCESS OBBLEAOHING.

Patented Aug. 23, 1892.

wi/ihmwe/a lip WM UNITED STATES PATENT Grates.

JOSEPH A. MYRIOK, or SALISBURY, NORTH CAROLINA.

PROCESS GF BLEACHiNGQ SIEOIFICATION'forming part of Letters Patent No.481,414, dated August 23,1892. Application filed Aprill, 1892. SerialNo. 427,354- (No specimens.)

To all whom it may concern."

Be it known that I, JOSEPH A. Minion, a citizen of the United States,residing at Salisbury, in the county of Rowan and State of NorthCarolina, have invented certain new and useful Improvements in Processesof Bleaching Cotton Chain \Varp; and I :do hereby declare the followingto be a full, clear, and exact description of the inventi0n,.such aswill enable others skilled in the art to which it appertains to make-anduse the same.

,My present invention relates to the art of bleaching cotton-chain warpand analogous fiber, and hasfor its object certain improvements whichwill be fully disclosed in the following specification and claims. I Forthe purpose of illustration I have shown one form-of apparatus forcarrying out my invention in the accompanying drawing, which forms partof this specification, and said drawing represents a verticallongitudinal section of such apparatus.

Reference being had to the drawing and the letters thereon, A indicatesa tank or trough separated into compartments or baths B, O, D, and E,each of which is provided with rolls a, suitably supported in a frameI), attached to the sides of the tank. to revolve freely as the warp,filling, or fiber F is drawn through the several baths by thedrawingrolls G, a pair of which is attached at one end of each bath. Theupper roll of each pair is provided with a weight 0 to press the liquidout of the warp as it passes through the rolls and return the same tothe bath from which the warp last emerged. After leaving the last orrinsin gbath the warp is passed over a roll or spool H and is thendried. The compartment B contains chloride of lime of a strength of from1 or 1% to 3 Baum. The second compartment G contains hot water kept ator near the boiling-point to remove the chloride of ii me contained inthe warp. The third compartment D contains a solution of sulphurous acidand water (preferably cold water) of a strength of from 1 to 2 B-ium andthe fourth compartment E contains pure clear water. Cotton-chain warp,filling, or fiber F to be bleached is drawn through the compartment B,passingback and forth over the rollers a. and through the chloride oflime until it emerges at the surface of the bath or liquid where theinitial bleaching effected, when it 'passes between the first pair'ofrolls G, which express the liquid from the warp, which falls back intothe compartment B. After leaving the rolls the warp is exposed to thecompartment C. It is then conducted into the compartment D, passes overthe rolls a hack and forth through the weak solution of sulphurous acid,where the bleaching is completed, emerges therefrom at the surface ofthe liquid, and passes between the third pair of rolls, which expressthe liquid from the warp, which liquid falls back into the compartment Dand the warp exposed to the atmosphere and liquid evaporated from thetime it leaves the rolls until it enters the compartment E. The warp isthen conducted into compartment E, where it passes back and forth overthe rolls a through the pure water, is thoroughly rinsed, and emerges atthe surface of the bath. It then passes between the fourth pair of rollsin which the water is expressed from the warp and the warp conductedover the roll or spool H on its way to the dry-' ing apparatus. In thelatter compartmentE freshwater is constantly supplied while theoperation of bleaching'is carried on, and the impurities derived fromrinsing the warp pass off in a thin sheet or film through theoverflow-passage (I.

I am aware that a dilutesolution of oxy chloride of calci um andsulphurous-acid vapor has been used for decolorizing straw. This processis slow and-tedious, and I therefore do "oi-lime, expressing the liquidfrom the fiber presence of two witnesses.

" 2; The process of bleaching cotton-chain acid and again subjecting thefiber to the atwarpor analogous fiber, which consists in mosphere,-andfinaiiy'rinsing thefiber.

[O subjecting the'fibei' to a solution of chloride In testimonywhereof-leffixmy si gneturein and exposing it'to the'atmosphere, thensub- JOSEPH A. MYRICK. jecting the fiber to hot-water and expressingWitnesses: the water, then subjecting the fiber to a weak D. O. REINOHL,

solution of sulphurousacid, expressing said H. B. REITQHL

